HADOOP-16118. S3Guard to support on-demand DDB tables.
This is the first step for on-demand operations: things recognize when they are using on-demand tables, as do the tests. Contributed by Steve Loughran.
This commit is contained in:
Steve Loughran
parent
fcc7f9b32f
commit
cf4efcab3b
@ -210,6 +210,18 @@ public class DynamoDBMetadataStore implements MetadataStore,
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public static final String E_INCOMPATIBLE_VERSION
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= "Database table is from an incompatible S3Guard version.";
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@VisibleForTesting
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static final String BILLING_MODE
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= "billing-mode";
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@VisibleForTesting
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static final String BILLING_MODE_PER_REQUEST
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= "per-request";
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@VisibleForTesting
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static final String BILLING_MODE_PROVISIONED
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= "provisioned";
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@VisibleForTesting
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static final String DESCRIPTION
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= "S3Guard metadata store in DynamoDB";
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@ -229,6 +241,9 @@ public class DynamoDBMetadataStore implements MetadataStore,
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@VisibleForTesting
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static final String THROTTLING = "Throttling";
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public static final String E_ON_DEMAND_NO_SET_CAPACITY
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= "Neither ReadCapacityUnits nor WriteCapacityUnits can be specified when BillingMode is PAY_PER_REQUEST";
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private static ValueMap deleteTrackingValueMap =
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new ValueMap().withBoolean(":false", false);
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@ -1515,6 +1530,10 @@ public Map<String, String> getDiagnostics() throws IOException {
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= desc.getProvisionedThroughput();
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map.put(READ_CAPACITY, throughput.getReadCapacityUnits().toString());
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map.put(WRITE_CAPACITY, throughput.getWriteCapacityUnits().toString());
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map.put(BILLING_MODE,
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throughput.getWriteCapacityUnits() == 0
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? BILLING_MODE_PER_REQUEST
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: BILLING_MODE_PROVISIONED);
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map.put(TABLE, desc.toString());
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map.put(MetadataStoreCapabilities.PERSISTS_AUTHORITATIVE_BIT,
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Boolean.toString(true));
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@ -1558,6 +1577,11 @@ public void updateParameters(Map<String, String> parameters)
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S3GUARD_DDB_TABLE_CAPACITY_WRITE_KEY,
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currentWrite);
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if (currentRead == 0 || currentWrite == 0) {
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// table is pay on demand
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throw new IOException(E_ON_DEMAND_NO_SET_CAPACITY);
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}
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if (newRead != currentRead || newWrite != currentWrite) {
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LOG.info("Current table capacity is read: {}, write: {}",
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currentRead, currentWrite);
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@ -272,7 +272,7 @@ Next, you can choose whether or not the table will be automatically created
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</property>
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```
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### 7. If creating a table: Set your DynamoDB IO Capacity
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### 7. If creating a table: Set your DynamoDB I/O Capacity
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Next, you need to set the DynamoDB read and write throughput requirements you
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expect to need for your cluster. Setting higher values will cost you more
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@ -286,7 +286,7 @@ Unit Calculations](http://docs.aws.amazon.com/amazondynamodb/latest/developergui
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The charges are incurred per hour for the life of the table, *even when the
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table and the underlying S3 buckets are not being used*.
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There are also charges incurred for data storage and for data IO outside of the
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There are also charges incurred for data storage and for data I/O outside of the
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region of the DynamoDB instance. S3Guard only stores metadata in DynamoDB: path names
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and summary details of objects —the actual data is stored in S3, so billed at S3
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rates.
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@ -315,10 +315,10 @@ rates.
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</property>
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```
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Attempting to perform more IO than the capacity requested throttles the
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IO, and may result in operations failing. Larger IO capacities cost more.
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Attempting to perform more I/O than the capacity requested throttles the
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I/O, and may result in operations failing. Larger I/O capacities cost more.
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We recommending using small read and write capacities when initially experimenting
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with S3Guard.
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with S3Guard, and considering DynamoDB On-Demand.
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## Authenticating with S3Guard
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@ -578,6 +578,7 @@ Filesystem s3a://ireland-1 is using S3Guard with store DynamoDBMetadataStore{reg
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Authoritative S3Guard: fs.s3a.metadatastore.authoritative=false
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Metadata Store Diagnostics:
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ARN=arn:aws:dynamodb:eu-west-1:00000000:table/ireland-1
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billing-mode=provisioned
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description=S3Guard metadata store in DynamoDB
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name=ireland-1
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read-capacity=20
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@ -738,7 +739,7 @@ Delete all entries more than 90 minutes old from the table "ireland-team" in
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the region "eu-west-1".
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### Tune the IO capacity of the DynamoDB Table, `s3guard set-capacity`
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### Tune the I/O capacity of the DynamoDB Table, `s3guard set-capacity`
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Alter the read and/or write capacity of a s3guard table.
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@ -764,6 +765,7 @@ and 20 write. (This is a low number, incidentally)
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2017-08-30 16:21:26,344 [main] INFO s3guard.DynamoDBMetadataStore (DynamoDBMetadataStore.java:updateParameters(1086)) - Changing capacity of table to read: 20, write: 20
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Metadata Store Diagnostics:
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ARN=arn:aws:dynamodb:eu-west-1:00000000000:table/ireland-1
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billing-mode=provisioned
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description=S3Guard metadata store in DynamoDB
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name=ireland-1
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read-capacity=25
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@ -785,6 +787,7 @@ write values match that already in use.
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2017-08-30 16:24:35,337 [main] INFO s3guard.DynamoDBMetadataStore (DynamoDBMetadataStore.java:updateParameters(1090)) - Table capacity unchanged at read: 20, write: 20
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Metadata Store Diagnostics:
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ARN=arn:aws:dynamodb:eu-west-1:00000000000:table/ireland-1
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billing-mode=provisioned
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description=S3Guard metadata store in DynamoDB
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name=ireland-1
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read-capacity=20
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@ -880,10 +883,10 @@ are only made after successful file creation, deletion and rename, the
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store is *unlikely* to get out of sync, it is still something which
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merits more testing before it could be considered reliable.
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## Managing DynamoDB IO Capacity
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## Managing DynamoDB I/O Capacity
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DynamoDB is not only billed on use (data and IO requests), it is billed
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on allocated IO Capacity.
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By default, DynamoDB is not only billed on use (data and I/O requests)
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-it is billed on allocated I/O Capacity.
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When an application makes more requests than
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the allocated capacity permits, the request is rejected; it is up to
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@ -954,22 +957,102 @@ If operations, especially directory operations, are slow, check the AWS
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console. It is also possible to set up AWS alerts for capacity limits
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being exceeded.
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### <a name="on-demand"></a> On-Demand Dynamo Capacity
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[Amazon DynamoDB On-Demand](https://aws.amazon.com/blogs/aws/amazon-dynamodb-on-demand-no-capacity-planning-and-pay-per-request-pricing/)
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removes the need to pre-allocate I/O capacity for S3Guard tables.
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Instead the caller is _only_ charged per I/O Operation.
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* There are no SLA capacity guarantees. This is generally not an issue
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for S3Guard applications.
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* There's no explicit limit on I/O capacity, so operations which make
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heavy use of S3Guard tables (for example: SQL query planning) do not
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get throttled.
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* There's no way put a limit on the I/O; you may unintentionally run up
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large bills through sustained heavy load.
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* The `s3guard set-capacity` command fails: it does not make sense any more.
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When idle, S3Guard tables are only billed for the data stored, not for
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any unused capacity. For this reason, there is no benefit from sharing
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a single S3Guard table across multiple buckets.
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*Enabling DynamoDB On-Demand for a S3Guard table*
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You cannot currently enable DynamoDB on-demand from the `s3guard` command
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when creating or updating a bucket.
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Instead it must be done through the AWS console or [the CLI](https://docs.aws.amazon.com/cli/latest/reference/dynamodb/update-table.html).
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From the Web console or the command line, switch the billing to pay-per-request.
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Once enabled, the read and write capacities of the table listed in the
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`hadoop s3guard bucket-info` command become "0", and the "billing-mode"
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attribute changes to "per-request":
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```
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> hadoop s3guard bucket-info s3a://example-bucket/
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Filesystem s3a://example-bucket
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Location: eu-west-1
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Filesystem s3a://example-bucket is using S3Guard with store
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DynamoDBMetadataStore{region=eu-west-1, tableName=example-bucket,
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tableArn=arn:aws:dynamodb:eu-west-1:11111122223333:table/example-bucket}
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Authoritative S3Guard: fs.s3a.metadatastore.authoritative=false
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Metadata Store Diagnostics:
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ARN=arn:aws:dynamodb:eu-west-1:11111122223333:table/example-bucket
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billing-mode=per-request
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description=S3Guard metadata store in DynamoDB
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name=example-bucket
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persist.authoritative.bit=true
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read-capacity=0
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region=eu-west-1
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retryPolicy=ExponentialBackoffRetry(maxRetries=9, sleepTime=250 MILLISECONDS)
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size=66797
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status=ACTIVE
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table={AttributeDefinitions:
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[{AttributeName: child,AttributeType: S},
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{AttributeName: parent,AttributeType: S}],
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TableName: example-bucket,
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KeySchema: [{
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AttributeName: parent,KeyType: HASH},
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{AttributeName: child,KeyType: RANGE}],
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TableStatus: ACTIVE,
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CreationDateTime: Thu Oct 11 18:51:14 BST 2018,
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ProvisionedThroughput: {
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LastIncreaseDateTime: Tue Oct 30 16:48:45 GMT 2018,
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LastDecreaseDateTime: Tue Oct 30 18:00:03 GMT 2018,
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NumberOfDecreasesToday: 0,
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ReadCapacityUnits: 0,
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WriteCapacityUnits: 0},
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TableSizeBytes: 66797,
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ItemCount: 415,
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TableArn: arn:aws:dynamodb:eu-west-1:11111122223333:table/example-bucket,
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TableId: a7b0728a-f008-4260-b2a0-aaaaabbbbb,}
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write-capacity=0
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The "magic" committer is supported
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```
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### <a name="autoscaling"></a> Autoscaling S3Guard tables.
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[DynamoDB Auto Scaling](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/AutoScaling.html)
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can automatically increase and decrease the allocated capacity.
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This is good for keeping capacity high when needed, but avoiding large
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bills when it is not.
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Before DynamoDB On-Demand was introduced, autoscaling was the sole form
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of dynamic scaling.
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Experiments with S3Guard and DynamoDB Auto Scaling have shown that any Auto Scaling
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operation will only take place after callers have been throttled for a period of
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time. The clients will still need to be configured to retry when overloaded
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until any extra capacity is allocated. Furthermore, as this retrying will
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block the threads from performing other operations -including more IO, the
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block the threads from performing other operations -including more I/O, the
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the autoscale may not scale fast enough.
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We recommend experimenting with this, based on usage information collected
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from previous days, and and choosing a combination of
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retry counts and an interval which allow for the clients to cope with
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some throttling, but not to time out other applications.
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This is why the DynamoDB On-Demand appears to be a better option for
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workloads with Hadoop, Spark, Hive and other applications.
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If autoscaling is to be used, we recommend experimenting with the option,
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based on usage information collected from previous days, and choosing a
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combination of retry counts and an interval which allow for the clients to cope with
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some throttling, but not to time-out other applications.
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## Troubleshooting
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@ -1022,7 +1105,7 @@ Consider increasing your provisioning level with the UpdateTable API.
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(Service: AmazonDynamoDBv2; Status Code: 400;
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Error Code: ProvisionedThroughputExceededException;
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```
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The IO load of clients of the (shared) DynamoDB table was exceeded.
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The I/O load of clients of the (shared) DynamoDB table was exceeded.
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1. Increase the capacity of the DynamoDB table.
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1. Increase the retry count and/or sleep time of S3Guard on throttle events.
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@ -1069,6 +1152,18 @@ java.io.IOException: Invalid region specified "iceland-2":
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The region specified in `fs.s3a.s3guard.ddb.region` is invalid.
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# "Neither ReadCapacityUnits nor WriteCapacityUnits can be specified when BillingMode is PAY_PER_REQUEST"
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```
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ValidationException; One or more parameter values were invalid:
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Neither ReadCapacityUnits nor WriteCapacityUnits can be specified when
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BillingMode is PAY_PER_REQUEST
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(Service: AmazonDynamoDBv2; Status Code: 400; Error Code: ValidationException)
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```
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On-Demand DynamoDB tables do not have any fixed capacity -it is an error
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to try to change it with the `set-capacity` command.
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## Other Topics
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For details on how to test S3Guard, see [Testing S3Guard](./testing.html#s3guard)
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@ -0,0 +1,108 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.fs.s3a.s3guard;
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import java.util.Map;
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import java.util.Objects;
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import org.junit.Assert;
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import static org.apache.hadoop.fs.s3a.s3guard.DynamoDBMetadataStore.READ_CAPACITY;
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class DDBCapacities {
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private final long read, write;
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DDBCapacities(long read, long write) {
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this.read = read;
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this.write = write;
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}
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public long getRead() {
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return read;
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}
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public long getWrite() {
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return write;
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}
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String getReadStr() {
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return Long.toString(read);
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}
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String getWriteStr() {
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return Long.toString(write);
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}
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void checkEquals(String text, DDBCapacities that) throws Exception {
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if (!this.equals(that)) {
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throw new Exception(text + " expected = " + this +"; actual = "+ that);
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}
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) {
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return true;
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}
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if (o == null || getClass() != o.getClass()) {
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return false;
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}
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DDBCapacities that = (DDBCapacities) o;
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return read == that.read && write == that.write;
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}
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@Override
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public int hashCode() {
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return Objects.hash(read, write);
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}
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@Override
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public String toString() {
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final StringBuilder sb = new StringBuilder("Capacities{");
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sb.append("read=").append(read);
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sb.append(", write=").append(write);
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sb.append('}');
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return sb.toString();
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}
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/**
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* Is the the capacity that of a pay-on-demand table?
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* @return true if the capacities are both 0.
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*/
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public boolean isOnDemandTable() {
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return read == 0 && write == 0;
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}
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/**
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* Given a diagnostics map from a DDB store, extract the capacities.
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* @param diagnostics diagnostics map to examine.
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* @return the capacities
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* @throws AssertionError if the fields are missing.
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*/
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public static DDBCapacities extractCapacities(
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final Map<String, String> diagnostics) {
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String read = diagnostics.get(READ_CAPACITY);
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Assert.assertNotNull("No " + READ_CAPACITY + " attribute in diagnostics",
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read);
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return new DDBCapacities(
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Long.parseLong(read),
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Long.parseLong(diagnostics.get(DynamoDBMetadataStore.WRITE_CAPACITY)));
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}
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}
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@ -116,6 +116,10 @@ public MetadataStore createMetadataStore() throws IOException {
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assumeTrue("Metadata store for " + fs.getUri() + " is " + store
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+ " -not DynamoDBMetadataStore",
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store instanceof DynamoDBMetadataStore);
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DDBCapacities capacities = DDBCapacities.extractCapacities(
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store.getDiagnostics());
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assumeTrue("DBB table is on-demand",
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!capacities.isOnDemandTable());
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DynamoDBMetadataStore fsStore = (DynamoDBMetadataStore) store;
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Configuration conf = new Configuration(fs.getConf());
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@ -22,7 +22,6 @@
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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import java.util.Random;
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import java.util.UUID;
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import java.util.concurrent.Callable;
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@ -39,17 +38,17 @@
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.s3a.Constants;
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import org.apache.hadoop.fs.s3a.S3AFileSystem;
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import org.apache.hadoop.fs.s3a.S3AUtils;
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import org.apache.hadoop.fs.s3a.s3guard.S3GuardTool.Destroy;
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import org.apache.hadoop.fs.s3a.s3guard.S3GuardTool.Init;
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import org.apache.hadoop.test.LambdaTestUtils;
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import static org.apache.hadoop.fs.s3a.Constants.S3GUARD_DDB_REGION_KEY;
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import static org.apache.hadoop.fs.s3a.Constants.S3GUARD_DDB_TABLE_NAME_KEY;
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import static org.apache.hadoop.fs.s3a.Constants.S3GUARD_DDB_TABLE_TAG;
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import static org.apache.hadoop.fs.s3a.S3AUtils.setBucketOption;
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import static org.apache.hadoop.fs.s3a.s3guard.DynamoDBMetadataStore.*;
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import static org.apache.hadoop.fs.s3a.s3guard.S3GuardTool.*;
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import static org.apache.hadoop.fs.s3a.s3guard.S3GuardToolTestHelper.exec;
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import static org.apache.hadoop.test.LambdaTestUtils.intercept;
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/**
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* Test S3Guard related CLI commands against DynamoDB.
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@ -85,7 +84,7 @@ public void testInvalidRegion() throws Exception {
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final String testRegion = "invalidRegion";
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// Initialize MetadataStore
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final Init initCmd = new Init(getFileSystem().getConf());
|
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LambdaTestUtils.intercept(IOException.class,
|
||||
intercept(IOException.class,
|
||||
new Callable<String>() {
|
||||
@Override
|
||||
public String call() throws Exception {
|
||||
@ -160,73 +159,8 @@ private String tagMapToStringParams(Map<String, String> tagMap) {
|
||||
return stringBuilder.toString();
|
||||
}
|
||||
|
||||
|
||||
private static class Capacities {
|
||||
private final long read, write;
|
||||
|
||||
Capacities(long read, long write) {
|
||||
this.read = read;
|
||||
this.write = write;
|
||||
}
|
||||
|
||||
public long getRead() {
|
||||
return read;
|
||||
}
|
||||
|
||||
public long getWrite() {
|
||||
return write;
|
||||
}
|
||||
|
||||
String getReadStr() {
|
||||
return Long.toString(read);
|
||||
}
|
||||
|
||||
String getWriteStr() {
|
||||
return Long.toString(write);
|
||||
}
|
||||
|
||||
void checkEquals(String text, Capacities that) throws Exception {
|
||||
if (!this.equals(that)) {
|
||||
throw new Exception(text + " expected = " + this +"; actual = "+ that);
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object o) {
|
||||
if (this == o) {
|
||||
return true;
|
||||
}
|
||||
if (o == null || getClass() != o.getClass()) {
|
||||
return false;
|
||||
}
|
||||
Capacities that = (Capacities) o;
|
||||
return read == that.read && write == that.write;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
return Objects.hash(read, write);
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
final StringBuilder sb = new StringBuilder("Capacities{");
|
||||
sb.append("read=").append(read);
|
||||
sb.append(", write=").append(write);
|
||||
sb.append('}');
|
||||
return sb.toString();
|
||||
}
|
||||
}
|
||||
|
||||
private Capacities getCapacities() throws IOException {
|
||||
Map<String, String> diagnostics = getMetadataStore().getDiagnostics();
|
||||
return getCapacities(diagnostics);
|
||||
}
|
||||
|
||||
private Capacities getCapacities(Map<String, String> diagnostics) {
|
||||
return new Capacities(
|
||||
Long.parseLong(diagnostics.get(DynamoDBMetadataStore.READ_CAPACITY)),
|
||||
Long.parseLong(diagnostics.get(DynamoDBMetadataStore.WRITE_CAPACITY)));
|
||||
private DDBCapacities getCapacities() throws IOException {
|
||||
return DDBCapacities.extractCapacities(getMetadataStore().getDiagnostics());
|
||||
}
|
||||
|
||||
@Test
|
||||
@ -240,7 +174,11 @@ public void testDynamoDBInitDestroyCycle() throws Throwable {
|
||||
Init initCmd = new Init(fs.getConf());
|
||||
expectSuccess("Init command did not exit successfully - see output",
|
||||
initCmd,
|
||||
"init", "-meta", "dynamodb://" + testTableName, testS3Url);
|
||||
Init.NAME,
|
||||
"-" + READ_FLAG, "2",
|
||||
"-" + WRITE_FLAG, "2",
|
||||
"-" + META_FLAG, "dynamodb://" + testTableName,
|
||||
testS3Url);
|
||||
// Verify it exists
|
||||
MetadataStore ms = getMetadataStore();
|
||||
assertTrue("metadata store should be DynamoDBMetadataStore",
|
||||
@ -253,7 +191,7 @@ public void testDynamoDBInitDestroyCycle() throws Throwable {
|
||||
Configuration conf = fs.getConf();
|
||||
String bucket = fs.getBucket();
|
||||
// force in a new bucket
|
||||
S3AUtils.setBucketOption(conf, bucket, Constants.S3_METADATA_STORE_IMPL,
|
||||
setBucketOption(conf, bucket, Constants.S3_METADATA_STORE_IMPL,
|
||||
Constants.S3GUARD_METASTORE_DYNAMO);
|
||||
initCmd = new Init(conf);
|
||||
String initOutput = exec(initCmd,
|
||||
@ -273,18 +211,32 @@ public void testDynamoDBInitDestroyCycle() throws Throwable {
|
||||
// get the current values to set again
|
||||
|
||||
// play with the set-capacity option
|
||||
Capacities original = getCapacities();
|
||||
String fsURI = getFileSystem().getUri().toString();
|
||||
String capacityOut = exec(newSetCapacity(),
|
||||
S3GuardTool.SetCapacity.NAME,
|
||||
fsURI);
|
||||
LOG.info("Set Capacity output=\n{}", capacityOut);
|
||||
capacityOut = exec(newSetCapacity(),
|
||||
S3GuardTool.SetCapacity.NAME,
|
||||
"-" + READ_FLAG, original.getReadStr(),
|
||||
"-" + WRITE_FLAG, original.getWriteStr(),
|
||||
fsURI);
|
||||
LOG.info("Set Capacity output=\n{}", capacityOut);
|
||||
DDBCapacities original = getCapacities();
|
||||
String fsURI = getFileSystem().getUri().toString();
|
||||
if (!original.isOnDemandTable()) {
|
||||
// classic provisioned table
|
||||
assertTrue("Wrong billing mode in " + info,
|
||||
info.contains(BILLING_MODE_PROVISIONED));
|
||||
String capacityOut = exec(newSetCapacity(),
|
||||
SetCapacity.NAME,
|
||||
fsURI);
|
||||
LOG.info("Set Capacity output=\n{}", capacityOut);
|
||||
capacityOut = exec(newSetCapacity(),
|
||||
SetCapacity.NAME,
|
||||
"-" + READ_FLAG, original.getReadStr(),
|
||||
"-" + WRITE_FLAG, original.getWriteStr(),
|
||||
fsURI);
|
||||
LOG.info("Set Capacity output=\n{}", capacityOut);
|
||||
} else {
|
||||
// on demand table
|
||||
assertTrue("Wrong billing mode in " + info,
|
||||
info.contains(BILLING_MODE_PER_REQUEST));
|
||||
// on demand tables fail here, so expect that
|
||||
intercept(IOException.class, E_ON_DEMAND_NO_SET_CAPACITY,
|
||||
() -> exec(newSetCapacity(),
|
||||
SetCapacity.NAME,
|
||||
fsURI));
|
||||
}
|
||||
|
||||
// that call does not change the values
|
||||
original.checkEquals("unchanged", getCapacities());
|
||||
|
||||
Loading…
Reference in New Issue
Block a user